JP2002116169A - Portable gas detector and its cradle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable gas detector easy in calibrating sensors and securing working power. SOLUTION: A plurality of openings for housing gas sensors 5 therein are formed in one side part of a body 1 forming a case mountable on a human body. Charging terminals 38 and a window 14 for communication are provided on the other side part thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a small gas detector that can be worn on the body and a cradle suitable for the same.

[0002]

2. Description of the Related Art A gas detection device which can be worn on clothes or a body and constantly measure gas in a working environment is constituted by accommodating a plurality of types of gas sensors, a power supply and a display in a small case. ing. Such a device is used for the purpose of detecting toxic gas and the like in the environment of a work site at an early stage to prevent an accident before it occurs, and therefore high reliability is required. In order to ensure reliability, it is necessary that each sensor can reliably detect a target gas and that sufficient electric power is secured.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide a portable gas detection device which can easily calibrate a sensor and secure operating power. To provide. Another object of the present invention is to provide a cradle suitable for the portable gas detection device.

[0004]

SUMMARY OF THE INVENTION In order to solve such a problem, according to the present invention, a plurality of openings are formed on one side of a case which can be mounted on a body to accommodate a gas sensor and the other side is accommodated. A charging terminal and a communication terminal are provided on a side portion.

[0005]

When the standard gas is supplied from one side, the gas sensor can be calibrated, and charging can be performed from the other side which does not hinder the supply of the standard gas.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a first embodiment of the present invention. FIGS. 1 to 3 each show an embodiment of a small gas measuring apparatus according to the present invention, and a case main body 1 formed by polymer injection molding.
And a conductive lid 2, a case is formed, and a power supply unit 3, a signal processing unit 4, and a sound generating element 7, which will be described later, are accommodated therein. In addition, a thin metal plate 1a (a region where dots are drawn in FIG. 2) which also serves as a decoration is integrally embedded in the case body 1 by insert molding.

As described above, by disposing the thin metal plate 1a on the surface of the case body 1 made of a polymer material and easily charged with static electricity, the generation of static electricity can be suppressed as much as possible, and in an environment where flammable gas is present. But it can be used safely.

[0008] At both ends of the case body 1, band fixing portions 1
b and 1b are formed, and the apparatus is configured to be attached to an arm by attaching a band (not shown).

The signal processing unit 4 includes a storage element for storing log data, a liquid crystal panel 41, an external operation switch 42,
The case main body 1 is configured by mounting the warning light emitting element 43.
Is fixed to the case body 1 so that the liquid crystal panel 41 is exposed from the window 11.

A recess 12 is formed in the side of the case body 1, and a plurality of button-type gas sensors 5 for detecting different gases are accommodated therein as shown in FIG. As shown in FIGS. 5 and 6, a sensor fixing frame 61 having a window 61a for separating a gas inlet of each sensor is provided outside the gas sensor 5, and protrusions 1c of the case body 1 are provided by claws 61b at both ends. And is attached to the case main body 1.

On the surface of the sensor fixing frame 61, a filter fixing frame 63 laid down with a common dustproof filter 62 for removing atmospheric dust flowing into each sensor 5 is mounted. The filter fixing frame 63 has a gas inlet 63a formed at a position facing each sensor, and is fixed to the sensor fixing frame 61 by four claws 63b formed on its side. Further, since the type of sensor is affected by the interfering gas, a filter 6 for removing the interfering gas is used.
Reference numerals 4 and 65 denote a sensor fixing frame 61 and a dust removal filter 6.
2 is interposed.

The two fixing frames 61 and 63 mounted on the case body 1 in a stacked state as described above are fixed to the case body 1 by inserting the screws 66 into the through holes 61c and 63c formed therein. I have. Note that reference numerals 68 and 69 in the figure each indicate an annular packing.

When the sensitivity of the sensor 65 decreases due to long-term use, the screws 66 are removed as shown in FIG.
By removing from the sensor, the sensor can be easily replaced. When the functions of the filters 62, 65 and 66 are deteriorated, the filters 62, 65 and 66 can be easily replaced by removing the filter fixing frame 63. By removing the screw frame 63, the dustproof filter 62 and the interference gas removing filters 65 and 66 can be easily replaced.

Returning to FIG. 1, a charging contact 13 connected to the charging terminal 38 of the power supply unit 3 and a window 14 for infrared communication are formed on the other side of the case main body 1.

FIG. 8 shows an embodiment of the power supply unit 3, in which a secondary battery 31 is mounted on a substrate 32, a current limiting resistor 33 is connected in series to a terminal, and the terminal is connected to a connector 34. The members related to power supply, that is, the battery, the current limiting resistor 33 and the conductive pattern are
Cover 3 provided with a fixed claw 35a engaging with the concave portion 1d
5 and the back cover 36 cover the front and back. The front cover 35 has a protrusion 35b formed inward,
The plate-shaped back cover 36 is fixed by the projection 35b. In the drawings, reference numeral 37 denotes a backup battery, reference numeral 38 denotes a charging terminal, and reference numeral 39 denotes a battery cover.

Next, an assembling process of the above device will be described with reference to FIG. The case body 1 is provided with a concave portion 1e which engages with a projection (not shown) on the back surface of a later-described locking piece 45 on the side where the liquid crystal panel 41 is mounted (upper part in the figure). Electrodes 41 on both sides (upper and lower ends in the figure)
The liquid crystal panel 41 on which a and 41b are formed is incorporated. It is desirable that the liquid crystal panel 41 has a light emitting means such as a light emitting diode attached to a side portion thereof and has a backlight which is illuminated from the back surface by a scattering plate.

Connecting members 44, 44 made of anisotropic conductive rubber are placed at positions facing these electrodes 41a, 41b, and a liquid crystal driving circuit or the like having electrodes formed at positions facing the connecting members 44, 44 is provided. The mounted signal processing unit 4 is placed. In this state, the signal processing unit 4 is pressed vertically and the locking piece 45 having a width of about the width of the signal processing unit 4 is
The signal processing unit 4 is fixed to the case body 1 with the plurality of projections 45 a formed on the surface of the locking piece 45 while the connection member 44 is elastically pressed. Thereafter, the power supply unit 3 is mounted through the connection board 46 on which the connector for connecting the signal processing unit 4 to the power supply unit 3 and the outside is mounted, and then the packing 8 is attached to the periphery of the opening of the case body. The lid 2 is interposed and fixed with screws or the like.

As described above, the connecting member 44 made of anisotropic conductive rubber is provided between the liquid crystal panel 41 and the signal processing unit 4.
The locking piece 45 is loaded in a state where the connecting member 44 is resiliently pressed in a direction perpendicular to the panel 41 and the unit 4. Therefore, a force for inclining the connecting member 44 does not act. Accordingly, each layer can be electrically connected to the inner wall of the case main body 1 without requiring fixing means such as screws, without causing electrical leakage between the electrodes formed at a small pitch. Note that reference numeral 47 in FIG.
Indicates a frame for fixing the sounding body 7.

With such a configuration, the power supply unit 3 can be mounted and fixed to the case body 1 without the need for screws, and the cover 2 is removed to open the case.
The power supply unit 3 can be easily replaced simply by releasing the engagement between the claw 35a and the concave portion 1d.

In this embodiment, when the gas in the environment flows into the gas sensors 5 with the small gas measuring device fixed to the arm with a band, each sensor 5 responds to each gas and corresponds to the concentration. Output a signal.

The circuit mounted on the signal processing unit 4 is as follows:
The signal from each sensor 5 is taken in, the gas concentration at each time is stored in the storage means, and the concentration of the gas selected by the external operation switch is displayed on the liquid crystal panel 41. The time can be displayed by operating the external operation switch as needed.

On the other hand, if the gas concentration detected by the sensor 5 exceeds the reference level, the alarm light emitting element 4
3 flashes, and the sounding element 7 emits an alarm sound, and the concentration of this gas is automatically displayed on the liquid crystal panel 41.

In the above-described embodiment, the case where the band is attached to the band fixing portions 1b and 1b and the band is attached to the arm has been described. However, as shown in FIG. 10, the band extends in the direction of the band fixing portion 1b. When a fixing member 73 having one end 72a fixed to the substrate 71 with the elastic piece 72 fixed in a cantilever shape is fixed to the band fixing portions 1b and 1b by inserting screws 74 into fixing holes 71 at both ends thereof. , Can be easily attached to clothes.

When a low-frequency vibrating means of about several tens of hertz is used as the sounding body 4, the elastic piece 72 resonates with the vibration propagated through the case body 1 and vibrates with a large amplitude. Can be amplified and transmitted reliably.

FIG. 11 shows an embodiment of a cradle suitable for the above-mentioned small gas measuring device. One side of the cradle is formed such that a recess 91 slightly larger than the width of the small gas detector is formed in the central region. Is formed on a base 94 with a housing 92 for a power supply circuit and the like, and a calibration gas supply unit 93 on the other side.

Two electrodes 95 formed of a conductive elastic member and capable of moving back and forth are provided on a wall 92a on the concave side of the accommodating portion 92, and a connector 96 for communicating with the outside is provided on the other side wall 92b. ing.

On the other hand, the calibration gas supply section 93 is normally urged by a spring so as to retreat from the recess 91, and is fitted with a slider 97 having a pressing section 97a at the other end in the moving direction. Have been. The slider 97 has a plurality of windows 97c on a wall surface 97b facing the concave portion 91 so as to correspond to the arrangement position of the sensors of the gas detector, and a gas supply port 97d for independently supplying a standard gas to each of the windows 97c. It is provided and configured.

In a region facing the rear end of the slider 97,
A locking piece 98a provided with a lever 98 which is constantly urged toward the slider and which can be operated externally is provided.

When the battery 31 has been exhausted due to long-term use, the small gas measuring device is placed in the recess of the cradle and the pressing portion is pushed in, and the slider 97 represses the side of the small gas measuring device. In this state, it is fixed by the locking piece 98a.

In this state, the two electrodes 95, 95
Charging terminal 3 of power supply unit 3 exposed from window 13
7 and 37, the secondary battery 31 can be charged, and the internal data can be read by infrared communication means. Furthermore, when the standard gas is supplied from the gas supply port 97d, the standard gas flows into each sensor 5 from the window 97c, so that calibration can be performed.

When the lever 98 is depressed at the stage when the operation via the cradle is completed, the slider 97 is retracted by the urging force of the spring to open the small gas measuring device. Can be taken out.

On the other hand, when the secondary battery 31 has deteriorated due to long-term use, the power supply unit 3 is replaced by disengaging the claws 35a of the cover 35 from the case body 1. At the time of replacement, even if a conductor comes into contact with the charging terminals 38, 38 of the power supply unit 3, the current limiting resistor 33 is connected between the secondary battery 31 and the charging terminals 38, 38. Even in an environment where a volatile gas is present, the situation does not lead to ignition. Even if the power supply unit 3 is accidentally dropped, the power supply member is covered by the cover 35, so that even if it comes into contact with a conductor, there is no short circuit, and the power supply member is in an environment where flammable gas is present. However, this does not lead to an explosion.

In the above-described embodiment, the cradle having the charging function, the communication function, and the gas calibration function has been described. However, as shown in FIG. Credor body 100
As an alternative, the gas calibration unit may be configured to be mountable as an option.

That is, the gas calibration unit includes the screw hole 100a of the credoll body 100 and the positioning protrusion 10
The above-mentioned slider 97 is accommodated in the base 101 in which the screw hole 101a and the concave portion 101b corresponding to 0b are formed so as to be movable and lockable by the lever 98, and the cover 10
2 is screwed to the base 101.

According to this, a calibration function can be easily added to the cradle main body 100 having only the charging function and the communication function by screwing the gas constituent unit as necessary.

[0036]

As described above, according to the present invention, a plurality of openings are formed on one side of a case which can be worn on the body to accommodate a gas sensor, and a charging terminal is provided on the other side. Since the communication terminal is provided, it is possible to supply the standard gas from one side to calibrate the gas sensor and to charge the gas sensor without obstructing the calibration.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are perspective views each showing an embodiment of a small gas measuring apparatus according to the present invention.

FIGS. 2A to 2C are a front view, a left side view, and a right side view, respectively, showing one embodiment of the small gas measuring device of the present invention.

FIG. 3 is a diagram showing a cross-sectional structure of the same device.

FIG. 4 is a sectional view showing one embodiment of a mounting portion of the gas sensor.

FIG. 5 is a cross-sectional view showing one embodiment of a frame constituting the mounting portion.

FIG. 6 is a perspective view showing one embodiment of a mounting portion of the gas sensor.

FIG. 7 is a diagram showing a state when the gas sensor is replaced.

FIGS. 8A to 8C are diagrams showing one embodiment of a power supply unit used in the above device.

FIG. 9 is a view showing an assembling process of the same device.

FIG. 10 is a view showing another embodiment of the wearing tool suitable for the small gas measuring device.

FIGS. 11A to 11C are perspective views showing an embodiment of a cradle used for the measuring device, respectively,
FIG. 3 is a top view and a main part cross-sectional view in a state where the measuring device is mounted.

FIG. 12 is a view showing another embodiment of credol.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main body 2 Lid 3 Power supply unit 4 Signal processing unit 5 Button type gas sensor 31 Secondary battery 32 Substrate 33 Current limiting resistance 34 Connector 35, 36 Cover 41 Liquid crystal panel 42 External operation switch 43 Alarm light emitting element

Continued on the front page (72) Inventor Masahide Kitamura 2-7-6 Shozuzawa, Itabashi-ku, Tokyo RIKEN Keiki Co., Ltd. F-term (reference) 2G060 AA01 AA02 AB00 AE19 AF07 BB13 BC05 BD08 BD10 HA01 HC07 HC15 HC19 HC22 HD01 HD02 HE01 5H030 AA01 AS11 BB01 DD20

Claims (7)

[Claims] 1. A portable gas detection device having a plurality of openings formed on one side of a case that can be worn on a body to accommodate a gas sensor and a charging terminal and a communication terminal provided on the other side. . 2. The charging terminal, the secondary battery, and the current limiting resistor are mounted on a circuit board, and the front and back of the secondary battery and the current limiting resistor are fixed by an insulating cover provided with a fixing means for fixing to the case. The portable gas detection device according to claim 1, wherein the portable gas detection device houses a covered power supply unit. 3. The portable gas detection device according to claim 2, wherein the charging terminal is exposed from a window formed in the case. 4. The portable gas detection device according to claim 1, wherein a common dust-proof filter is fixed to a gas inlet of the opening by a frame. 5. The container according to claim 1, wherein the case comprises a container body formed of a polymer material and a lid, and a part of the surface of the container body is covered with a thin plate made of a conductive material. Portable gas detector. 6. A vertical wall is provided on both sides so as to form a concave portion in which a portable gas detection device is placed in a central portion, and a power supply terminal and a communication terminal which can move forward and backward are provided on one of the vertical walls, and the other is provided with A cradle with a movable vertical wall and an outlet for reference gas. 7. The other vertical wall is constituted by a slider which is always urged to retreat from the concave portion and engages with a locking piece which maintains a state of being moved to the concave portion side. Item 7. The cradle according to item 6.